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A108341 Numbers n such that 997*n - 1009 is prime. 1

%I

%S 6,8,18,30,36,38,44,66,78,90,98,104,116,134,140,144,156,164,168,170,

%T 200,228,230,246,248,260,276,296,318,344,354,374,378,380,386,408,420,

%U 426,450,464,468,480,500,510,546,576,578,584,606,608,618,620,630,654,678

%N Numbers n such that 997*n - 1009 is prime.

%C 997 and 1009 are primes.

%C All terms are even. - _Harvey P. Dale_, Mar 09 2019

%H Harvey P. Dale, <a href="/A108341/b108341.txt">Table of n, a(n) for n = 1..1000</a>

%e If n=6, then 997*n - 1009 = 4973 (prime).

%e If n=90, then 997*n - 1009 = 88721 (prime).

%p a:=proc(n) if isprime(997*n-1009)=true then n else fi end: seq(a(n),n=1..750); # _Emeric Deutsch_, Jul 04 2005

%t Select[Range[2,700,2],PrimeQ[997#-1009]&] (* _Harvey P. Dale_, Mar 09 2019 *)

%o (PARI) is(n)=isprime(997*n-1009) \\ _Charles R Greathouse IV_, Jun 13 2017

%Y Cf. A101086.

%K nonn,easy,changed

%O 1,1

%A _Parthasarathy Nambi_, Jun 30 2005

%E More terms from _Emeric Deutsch_, Jul 04 2005

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Last modified August 20 01:14 EDT 2019. Contains 326136 sequences. (Running on oeis4.)